I don’t believe this is Blizzard’s issue to fix. Hear me out before you lynch me…
I fixed my problem this way…
- Uninstall NVIDIA driver 425.31 or any driver previous to 430.39
- Reboot the PC after uninstalling even if you aren’t told to do it.
- Download and install NVIDIA driver 430.39 using the CLEAN INSTALL method in the driver installer (important).
My problems went away and WoW behavior was returned to normal levels for me. Good luck. If the above steps don’t work for you, and if you don’t keep much on your PC but games, do a reformat/clean install of Windows and then load the new NVIDIA driver above starting at Step 3.
For good measure and less problems, you should always select “Custom” NVDIA driver installations and check the “Clean Install” box in the list of options.
Good luck
(I can confirm this works on RTX 2070’s in Windows 10 Pro 64-bit as that is what I’m working with)